Influence of sodium chloride on corrosion resistance of ever silver vessels in the presence of curd rice

Abstract

The present work is undertaken to investigate the corrosion resistance of ever silver in the presence of water, water+curd system, water+curd+rice system, water+curd+rice+Salt system. The corrosion resistance has been evaluated by AC impedance spectra . AC impedance spectra have been employed to investigate the corrosion resistance of ever silver electrode when it is immersed in various test solutions like water, curd, curd rice recipe, curd rice recipe with salt (sodium chloride 500 ppm). The corrosion resistance of ever silver electrode when it is immersed in various test solutions like water, water+curd, water+curd+rice and water+curd+rice+salt have been evaluated by AC impedance spectroscopy. If a protective film is formed, the charge transfer resistance increases, impedance value increases, phase angle value increases and double layer capacitance (Cdl) value decreases. When Ever silver electrode is immersed in water + curd rice system + 500ppmsodium chloride system, the corrosion resistance of ever silver electrode decreases. This is due to the presence of chloride ion introduced into the curd rice system. It implies that when curd rice is packed in vessels made of ever silver, we should avoid adding salt to the curd rice. It is better to keep the salt and curd rice separately. It is to be noted that this corrosion resistance is better than the corrosion resistance in water alone. The corrosion resistance decreases in the following order: Water + Curd + Rice system > Water + Curd + Rice + Salt system (sodium chloride 500ppm) > Water+ Curd system > Water

Keywords

• corrosion resistance, ever silver, curd rice, sodium chloride, electrochemical studies